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  1. By: Richens, Voit B.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 88
    Issue: 2
    Date: 1974
    Page Range: 191--196
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Richens, Voit B. - Lavigne, Gerald R.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 92
    Issue: 4
    Date: 1978
    Page Range: 334--344
    Publication Info: Ottawa Ottawa Field-Naturalists' Club